Title: RE: Frame Relay and DE bit

Larry,

The DE bit specifies that the Frame Relay network may discard this frame if it encounters congestion between the ingress and egress.  Generally speaking, the DE 'should' be set by your ingress router for all frames transmitted that exceed your CIR during the sample period (1 second).

The 'out bytes' counter is only related to the other 'out *' counters. In this case, you're transmitting no DE frames.  This tells me that 1) your router is not setting the DE bit on frames that exceed CIR, or 2) your traffic is not exceeding the outbound CIR.  If 2, then you've got low utilization or your CIR matches your physical bandwidth.  As for case 1, you must configure the router to set DE when exceeding CIR.  I believe this is a new feature, IOS 12 or 11.3.  However, I've never configured it.  Additionally, I don't think most Frame providers pay attention to it (I may be mistaken).

HTH

Patrick

-----Original Message-----
From: Chance, Larry [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 15, 2000 5:28 AM
To: 'GroupStudy'
Subject: Frame Relay and DE bit


What's the significance of the DE (Discard Eligible)
with this Frame Relay sample shown here?
Considering the volume of 'out bytes', is this ratio to
be expected or feared?

And what would I do to correct it?

===========SAMPLE=====================================================
Router1#sh frame pvc 33

PVC Statistics for interface Serial5/0 (Frame Relay DTE)

DLCI = 33, DLCI USAGE = LOCAL, PVC STATUS = ACTIVE, INTERFACE = Serial5/0.7

  input pkts 29768862      output pkts 16948699     in bytes 1918568914
  out bytes 2217045339     dropped pkts 5           in FECN pkts 0
  in BECN pkts 3717        out FECN pkts 0          out BECN pkts 0
  in DE pkts 21408982      out DE pkts 0
  out bcast pkts 399406     out bcast bytes 31994284
  pvc create time 29w4d, last time pvc status changed 12:58:55
Router1#
======================================================================

Later,
Larry

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